LG KG200 Service Manual - Page 24

Display/Illumination problems - keypad problem

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4. Troubleshooting Display/Illumination problems Make a general visual inspection for corrosion or oxidation from liquid damage. Turn the phone on. Check the LCD and the illumination. The illumination is lightened when the phone starts and will continue for approximately 20 sec Turn the phone on. Go to service test menu; choose "10. LCD" . You should see a pattern check that no lines or pixels are missing and that there are no discolorations. If necessary replace the LCM. If all segments are missing check that the LCD connector (Fig.5.1) and LCD FPC (Fig 5.2) is not mechanical damaged, dirty or oxidized. Turn the phone on. Go to service test menu; choose "9. LED" . The illumination should start flashing (Fig 5.3). Check that all 10 Keypad LEDs have the same illumination strength. If necessary replace the LED with the weakest light. Repeat this step until all LEDs light ever over the keypad. Fig.5.1 Fig.5.2 Fig.5.3 - 25 -

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4. Troubleshooting
- 25 -
Display/Illumination problems
Make a general visual inspection for corrosion or oxidation from liquid damage.
Turn the phone on. Check the LCD and the illumination. The illumination is lightened when the phone
starts and will continue for approximately 20 sec
Turn the phone on. Go to service test menu; choose “10. LCD” . You should see a pattern check that
no lines or pixels are missing and that there are no discolorations. If necessary replace the LCM.
If all segments are missing check that the LCD connector (Fig.5.1) and LCD FPC (Fig 5.2) is not
mechanical damaged, dirty or oxidized.
Turn the phone on. Go to service test menu; choose “9. LED” . The illumination should start flashing
(Fig 5.3).
Check that all 10 Keypad LEDs have the same illumination strength. If necessary replace the LED
with the weakest light. Repeat this step until all LEDs light ever over the keypad.
Fig.5.1
Fig.5.3
Fig.5.2